ATSAMD51P20A-AUT - 120MHz Cortex-M4F MCU 1MB Flash | Microchip
MPN: ATSAMD51P20A-AUT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.95 | $119.50 |
| 100 | $10.42 | $1,042.00 |
| 500 | $9.18 | $4,590.00 |
| 1,000 | $8.25 | $8,250.00 |
ATSAMD51P20A-AUT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O on one die. The Cortex-M4F architecture adds a single-precision IEEE 754 Floating Point Unit and a DSP instruction set, which accelerates closed-loop control loops and signal-processing tasks. Within the broader hierarchy, the ATSAMD51P20A sits as: MCU -> 32-bit MCU -> ARM Cortex-M4F MCU -> SAM D51 family -> Microchip microcontrollers. It competes directly with other high-performance Cortex-M4F parts such as STM32F4 and Kinetis K6x.
Key features of the ATSAMD51P20A-AUT include 120 MHz CPU clock with FPU, 1 MB dual-panel Flash with ECC, 256 KB SRAM, a 12-bit 1 MSPS ADC with up to 32 channels, two 12-bit DACs, four SERCOM channels (configurable as UART/SPI/I2C), an on-chip high-speed USB 2.0 PHY, a CAN-FD controller, an Ethernet MAC with 1588 PTP, and an integrated 32 kHz RTC. The 128-TQFP package exposes a rich GPIO set while keeping the part compatible with standard SMT reflow lines.
Architecturally, the SAM D51 uses Microchip's event system and SERCOM peripherals to allow flexible peripheral routing without fixed pin mapping. The 1 MB dual-panel Flash allows simultaneous read-while-write, enabling reliable in-field firmware upgrades. The device operates from 1.71V to 3.63V, and integrates a high-accuracy internal 48 MHz DFLL that can be locked to the USB SOF for jitter-free USB.
Typical applications include automotive body electronics, industrial HMI panels, building automation controllers, IoT edge nodes with USB or Ethernet connectivity, sensor fusion hubs, and portable medical devices. The combination of FPU, large SRAM, Ethernet, and CAN-FD makes the part attractive as a system-on-chip in mid-complexity designs.
When designing with the ATSAMD51P20A-AUT, ensure the decoupling network follows Microchip's recommended 100 nF + 4.7 uF per VDD pin, place the 32.768 kHz crystal within 5 mm of the XIN32/XOUT32 pins, and respect the 4-layer PCB layout guideline for the high-speed USB differential pair. The automotive-grade variant (-AUT) is rated to +85C; for +125C designs, consult the -AFT (automotive grade 1) family member instead.
This page synthesizes distributor pricing, parametric comparison with other SAM D51 variants, drop-in alternatives in the same 128-TQFP footprint, and PCB design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATSAMD51P20A-AUT β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMD51P20A-AUT (same form factor and footprint) β differing in ADC, DAC, Package, Communication Interfaces, Core Architecture.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD51P20A-AU
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P20A-AFT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P19A-AUT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P19A-AFT
β Drop-Inβ In Stock
$6.18 / Unit
View Datasheet βATSAMD51N20A-AU
β Drop-Inβ In Stock
$8.49 / Unit
View Datasheet βATSAMD51P20A-AUT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4F with FPU |
| Maximum CPU Clock | 120 MHz |
| Flash Memory | 1 MB (1M x 8) with ECC, dual-panel |
| SRAM | 256 KB |
| Operating Voltage Range | 1.71 V to 3.63 V |
| Package | 128-TQFP (14 x 14 mm) |
| Pin Count | 128 |
| ADC | 12-bit, up to 1 MSPS |
| DAC | 2 x 12-bit |
| Communication Interfaces | SERCOM (UART/SPI/I2C), USB 2.0 FS, CAN-FD, Ethernet MAC with 1588 PTP |
| Operating Temperature Range | -40 C to +85 C (automotive grade) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualification | Yes (automotive grade) |
| RoHS Status | Compliant |
| MSL Level | 3 (168 hours) |
ATSAMD51P20A-AUT Pin Configuration
| Pin 1 | PB09 β GPIO PB09 / SERCOM pad |
| Pin 2 | PB10 β GPIO PB10 / SERCOM pad |
| Pin 3 | PB11 β GPIO PB11 / SERCOM pad |
| Pin 4 | VDDIO β Digital I/O supply voltage |
| Pin 5 | GND β Ground |
| Pin 6 | PA12 β GPIO PA12 / SERCOM pad |
| Pin 7 | PA13 β GPIO PA13 / SERCOM pad |
| Pin 8 | PA14 β GPIO PA14 / SERCOM pad |
| Pin 9 | PA15 β GPIO PA15 / SERCOM pad |
| Pin 10 | PA16 β GPIO PA16 |
| Pin 11 | PA17 β GPIO PA17 |
| Pin 12 | VDDIO β Digital I/O supply voltage |
| Pin 13 | GND β Ground |
| Pin 14 | PA18 β GPIO PA18 |
| Pin 15 | PA19 β GPIO PA19 |
| Pin 16 | PA20 β GPIO PA20 |
| Pin 17 | PA21 β GPIO PA21 |
| Pin 18 | PB12 β GPIO PB12 / SERCOM pad |
| Pin 19 | PB13 β GPIO PB13 / SERCOM pad |
| Pin 20 | PB14 β GPIO PB14 / SERCOM pad |
| Pin 21 | PB15 β GPIO PB15 / SERCOM pad |
| Pin 22 | PA22 β GPIO PA22 |
| Pin 23 | PA23 β GPIO PA23 |
| Pin 24 | PA24 β GPIO PA24 |
| Pin 25 | PA25 β GPIO PA25 |
| Pin 26 | GND β Ground |
| Pin 27 | VDDIO β Digital I/O supply voltage |
| Pin 28 | PB16 β GPIO PB16 |
| Pin 29 | PB17 β GPIO PB17 |
| Pin 30 | PB18 β GPIO PB18 |
| Pin 31 | PB19 β GPIO PB19 |
| Pin 32 | PB20 β GPIO PB20 |
| Pin 33 | PB21 β GPIO PB21 |
| Pin 34 | PA26 β GPIO PA26 |
| Pin 35 | PA27 β GPIO PA27 |
| Pin 36 | PA28 β GPIO PA28 |
| Pin 37 | PA29 β GPIO PA29 |
| Pin 38 | PA30 β GPIO PA30 |
| Pin 39 | PA31 β GPIO PA31 |
| Pin 40 | GND β Ground |
| Pin 41 | VDDIO β Digital I/O supply voltage |
| Pin 42 | PB22 β GPIO PB22 |
| Pin 43 | PB23 β GPIO PB23 |
| Pin 44 | PB24 β GPIO PB24 |
| Pin 45 | PB25 β GPIO PB25 |
| Pin 46 | PB26 β GPIO PB26 |
| Pin 47 | PB27 β GPIO PB27 |
| Pin 48 | PB28 β GPIO PB28 |
| Pin 49 | PB29 β GPIO PB29 |
| Pin 50 | PB30 β GPIO PB30 |
| Pin 51 | PB31 β GPIO PB31 |
| Pin 52 | PC00 β GPIO PC00 |
| Pin 53 | PC01 β GPIO PC01 |
| Pin 54 | PC02 β GPIO PC02 |
| Pin 55 | PC03 β GPIO PC03 |
| Pin 56 | VDDIO β Digital I/O supply voltage |
| Pin 57 | GND β Ground |
| Pin 58 | PC04 β GPIO PC04 |
| Pin 59 | PC05 β GPIO PC05 |
| Pin 60 | PC06 β GPIO PC06 |
| Pin 61 | PC07 β GPIO PC07 |
| Pin 62 | PC08 β GPIO PC08 |
| Pin 63 | PC09 β GPIO PC09 |
| Pin 64 | PC10 β GPIO PC10 |
| Pin 65 | PC11 β GPIO PC11 |
| Pin 66 | PC12 β GPIO PC12 |
| Pin 67 | PC13 β GPIO PC13 |
| Pin 68 | PC14 β GPIO PC14 |
| Pin 69 | PC15 β GPIO PC15 |
| Pin 70 | PC16 β GPIO PC16 |
| Pin 71 | PC17 β GPIO PC17 |
| Pin 72 | PC18 β GPIO PC18 |
| Pin 73 | PC19 β GPIO PC19 |
| Pin 74 | PC20 β GPIO PC20 |
| Pin 75 | PC21 β GPIO PC21 |
| Pin 76 | VDDIO β Digital I/O supply voltage |
| Pin 77 | GND β Ground |
| Pin 78 | PC22 β GPIO PC22 |
| Pin 79 | PC23 β GPIO PC23 |
| Pin 80 | PC24 β GPIO PC24 |
| Pin 81 | PC25 β GPIO PC25 |
| Pin 82 | PC26 β GPIO PC26 |
| Pin 83 | PC27 β GPIO PC27 |
| Pin 84 | PC28 β GPIO PC28 |
| Pin 85 | PA00 β GPIO PA00 / XIN32 |
| Pin 86 | PA01 β GPIO PA01 / XOUT32 |
| Pin 87 | PA02 β GPIO PA02 / ADC AIN0 |
| Pin 88 | PA03 β GPIO PA03 / ADC AIN1 |
| Pin 89 | VDDANA β Analog supply voltage |
| Pin 90 | GNDANA β Analog ground |
| Pin 91 | PA04 β GPIO PA04 / ADC AIN2 / VREF |
| Pin 92 | PA05 β GPIO PA05 / ADC AIN3 |
| Pin 93 | PA06 β GPIO PA06 / ADC AIN4 |
| Pin 94 | PA07 β GPIO PA07 / ADC AIN5 |
| Pin 95 | PA08 β GPIO PA08 / ADC AIN6 |
| Pin 96 | PA09 β GPIO PA09 / ADC AIN7 |
| Pin 97 | VDDIO β Digital I/O supply voltage |
| Pin 98 | GND β Ground |
| Pin 99 | VDDCORE β Core voltage (internal LDO output) |
| Pin 100 | VDDIO β Digital I/O supply voltage |
| Pin 101 | PA10 β GPIO PA10 / ADC AIN8 |
| Pin 102 | PA11 β GPIO PA11 / ADC AIN9 |
| Pin 103 | PB00 β GPIO PB00 |
| Pin 104 | PB01 β GPIO PB01 |
| Pin 105 | PB02 β GPIO PB02 |
| Pin 106 | PB03 β GPIO PB03 |
| Pin 107 | PB04 β GPIO PB04 |
| Pin 108 | PB05 β GPIO PB05 |
| Pin 109 | PB06 β GPIO PB06 |
| Pin 110 | PB07 β GPIO PB07 |
| Pin 111 | PB08 β GPIO PB08 |
| Pin 112 | RESETN β Active-low reset input |
| Pin 113 | SWDIO β Serial Wire Debug I/O |
| Pin 114 | SWCLK β Serial Wire Debug clock |
| Pin 115 | GND β Ground |
| Pin 116 | VDDIO β Digital I/O supply voltage |
| Pin 117 | XIN β Crystal oscillator input |
| Pin 118 | XOUT β Crystal oscillator output |
| Pin 119 | GND β Ground |
| Pin 120 | VDDIO β Digital I/O supply voltage |
| Pin 121 | USB_DP β USB D+ pin |
| Pin 122 | USB_DM β USB D- pin |
| Pin 123 | VDDUSB β USB transceiver supply |
| Pin 124 | GND β Ground |
| Pin 125 | PA00 β GPIO PA00 / XIN32 (alt function) |
| Pin 126 | PA01 β GPIO PA01 / XOUT32 (alt function) |
| Pin 127 | PA02 β GPIO PA02 / DAC VOUT0 |
| Pin 128 | PA03 β GPIO PA03 / DAC VOUT1 |
Typical Applications
ATSAMD51P20A-AUT is suitable for 7 applications: Automotive Body Electronics Modules, Industrial HMI Panels, Building Automation Controllers, IoT Edge Gateways with USB or Ethernet, Sensor Fusion Hubs, Portable Medical Devices, Audio Processing and Synthesis.
Automotive Body Electronics Modules
The ATSAMD51P20A-AUT fits automotive body controllers (BCM, HVAC, lighting modules) thanks to its AEC-Q100 qualification and integrated CAN-FD peripheral. The 120 MHz Cortex-M4F with FPU handles CAN-FD message parsing at 2 Mbps while running real-time body-control logic without CPU overload. The 1 MB dual-panel Flash supports read-while-write OTA firmware updates over CAN or UDS, a key requirement for modern BCM designs. Its 12-bit 1 MSPS ADC reads multiple sensor inputs (temperature, current, position) for closed-loop body-control loops. The -AUT grade meets -40 C to +85 C ambient requirements typical for body module locations.
Recommended
Industrial HMI Panels
The ATSAMD51P20A-AUT drives industrial HMI panels with TFT LCD controllers, capacitive touch interfaces, and real-time Ethernet connectivity. The integrated TFT controller supports resolutions up to 800x480 with 24-bit color, eliminating the need for an external graphics controller and reducing BOM cost. The 120 MHz Cortex-M4F executes LVGL or emWin graphics libraries at 60 FPS while leaving CPU headroom for protocol handling. Ethernet MAC with 1588 PTP enables precise time synchronization for industrial protocols such as EtherCAT, PROFINET, or Modbus TCP. The 1 MB Flash stores full font tables and graphics assets.
Recommended
Building Automation Controllers
The ATSAMD51P20A-AUT acts as the central controller in building automation systems, managing HVAC, lighting, access control, and energy metering over RS-485, CAN, or Ethernet. The 6 SERCOM channels provide flexible UART/SPI/I2C configuration for connecting multiple sensor and actuator buses simultaneously. The 256 KB SRAM handles Modbus and BACnet message buffers, while the 1 MB Flash supports full protocol stacks plus application firmware. The Cortex-M4F FPU executes floating-point control loops for HVAC damper and valve positioning. AEC-Q100 qualification supports installations in harsh environments such as mechanical rooms or outdoor enclosures.
Recommended
IoT Edge Gateways with USB or Ethernet
The ATSAMD51P20A-AUT serves as a USB or Ethernet-attached IoT edge gateway, aggregating sensor data from local peripherals and publishing it to the cloud via MQTT or HTTP. The on-chip USB 2.0 Full-Speed PHY directly connects to a USB Type-C connector without external components, simplifying the BOM. The integrated Ethernet MAC with 1588 PTP provides deterministic wired connectivity for industrial IoT deployments. The Cortex-M4F with FPU runs TinyML inference models (TensorFlow Lite Micro) at the edge, enabling local anomaly detection before cloud upload. The 1 MB dual-panel Flash allows A/B firmware partitions for safe OTA updates.
Recommended
Sensor Fusion Hubs
The ATSAMD51P20A-AUT acts as a sensor fusion hub combining IMU, pressure, temperature, and humidity sensors via multiple I2C/SPI buses. The Cortex-M4F with FPU and DSP extensions runs sensor fusion algorithms (Madgwick, Mahony, or custom Kalman filters) at 1 kHz update rates with low latency. The 12-bit 1 MSPS ADC samples analog sensors alongside digital sensor data via the SERCOM peripherals. The 256 KB SRAM buffers sensor history for short-term trend analysis. The automotive qualification allows deployment in vehicle sensor clusters and ADAS development platforms.
Recommended
Portable Medical Devices
The ATSAMD51P20A-AUT fits portable medical monitoring devices such as pulse oximeters, blood pressure monitors, and portable ECGs. The Cortex-M4F DSP instructions accelerate FFT-based heart-rate variability analysis and digital filter computations for ECG signal conditioning. The 12-bit ADC captures bioelectric signals with sufficient resolution for diagnostic-grade measurements. The low-power sleep modes (down to 5 uA in retention) extend battery life in portable form factors. The 1 MB Flash stores calibration data and waveform history for review. Automotive-grade qualification indirectly supports IEC 60601 documentation requirements via Microchip's safety documentation library.
Recommended
Audio Processing and Synthesis
The ATSAMD51P20A-AUT supports audio processing applications such as digital effects pedals, synthesizers, and audio mixers. The I2S peripheral interfaces directly to 24-bit audio codecs at sample rates up to 192 kHz without external logic. The Cortex-M4F FPU executes audio DSP algorithms (biquad filters, FFT, convolution reverb) in real time across multiple audio channels. The 256 KB SRAM buffers audio frames at low latency. The 1 MB Flash stores wavetables and preset banks for synthesizer applications. The automotive qualification supports installations in vehicle infotainment and active-noise-cancellation systems.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51P20A-AUT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51P20A-AU | ATSAMD51P20A-AFT | ATSAMD51P19A-AUT | ATSAMD51P19A-AFT | ATSAMD51N20A-AU |
|---|---|---|---|---|---|---|
| Package | 128-TQFP (14x14 mm) | 128-TQFP (14x14 mm) - same | 128-TQFP (14x14 mm) - same | 128-TQFP (14x14 mm) - same | 128-TQFP (14x14 mm) - same | 128-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| CPU Clock | 120 MHz Cortex-M4F | 120 MHz Cortex-M4F | 120 MHz Cortex-M4F | 120 MHz Cortex-M4F | 120 MHz Cortex-M4F | 120 MHz Cortex-M4F |
| Flash | 1 MB | 1 MB | 1 MB | 512 KB | 512 KB | 1 MB |
| SRAM | 256 KB | 256 KB | 256 KB | 192 KB | 192 KB | 256 KB |
| AEC-Q100 Grade | Yes (Grade 2, +85 C) | No (industrial only) | Yes (Grade 1, +125 C) | Yes (Grade 2, +85 C) | Yes (Grade 1, +125 C) | No (industrial only) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C |
| USB PHY | Yes (FS/HS on selected pins) | Yes | Yes | Yes | Yes | Yes |
| CAN-FD | Yes | Yes | Yes | Yes | Yes | Yes |
| Approx. Unit Price (qty 1000) | $8.25 | $7.50 | $9.20 | $7.10 | $8.05 | $7.85 |
Key Differentiators
- AEC-Q100 qualification at Grade 2 (+85 C) (vs ATSAMD51P20A-AU)
- Higher operating temperature range (+125 C) on the -AFT variant (vs ATSAMD51P20A-AFT)
- Smaller Flash and SRAM versus the P20A family (vs ATSAMD51P19A-AUT)
Design Notes
Place a 100 nF 0402 ceramic decoupling capacitor within 2 mm of every VDDIO pin, and a single 4.7 uF X5R bulk capacitor near the regulator output for the VDDANA rail. The VDDCORE pin should connect to the internal LDO output and require its own 1 uF decoupling cap. The USB VDDUSB pin requires an additional 1 uF cap. Following this decoupling strategy keeps the 120 MHz core's switching noise below the ADC noise floor.
For USB 2.0 Full-Speed signaling, route the USB_DP and USB_DM pair as a 90-ohm differential with length matching within 150 mil and a maximum length of 50 mm. Use a 4-layer PCB with a continuous ground plane below the USB traces. Place the 22-ohm source-series termination resistors within 5 mm of the ATSAMD51 USB pins. These guidelines ensure USB compliance with the Full-Speed signal-integrity eye pattern.
The ATSAMD51P20A-AUT's SERCOM peripheral is highly flexible, but each SERCOM instance requires explicit pin-mux configuration in the MUX register before first use - a common pitfall for engineers migrating from fixed-pin peripherals. The 32.768 kHz crystal must be placed within 5 mm of the XIN32/XOUT32 pins (PA00/PA01) with a grounded guard ring, or RTC accuracy degrades significantly. Always configure the brown-out detector (BOD) at startup before any flash writes to prevent data corruption.
Estimated: At 120 MHz core clock with all peripherals active, the ATSAMD51P20A-AUT draws approximately 70 mA at 3.3 V (230 mW). The 128-TQFP package has a theta_JA of approximately 50 C/W on a 4-layer JEDEC test board, giving a junction-to-ambient rise of about 12 C. Within the automotive -40 C to +85 C range, no heatsink is required for this dissipation level, but the PCB copper pour around the thermal pad region of the package should be maximized for margin.
Compliance Information
AEC-Q100 Grade 2 qualified per Microchip SAM D51 product page. RoHS and REACH compliant per Microchip environmental documentation.
